linux系统里，emacs选中文字，就可以中键粘贴了。百度下面的参考文章，也说emacs默认支持。 spacemacs怎么不行？
参考文章： linux剪贴板原理 - LaoKa - 51CTO技术博客 http://laokaddk.blog.51cto.com/368606/945304/
结论（待确认，家里没linux系统环境试验）[已解决，linux下正常，而且能够显示变量x-select-enable-primary值]： 与两个变量有关 x-select-enable-clipboard。spacemacs里是默认为t x-select-enable-primary。spacemacs里c-h v里搜索不到这个变量描述 但是根据common-win.el里的代码定义，应该是
(setq x-select-enable-primary t)
参考内容–来自spacemacs帮助
x-select-text is a compiled Lisp function in `common-win.el'.
(x-select-text TEXT)
Select TEXT, a string, according to the window system.
On X, if `x-select-enable-clipboard' is non-nil, copy TEXT to the
clipboard. If `x-select-enable-primary' is non-nil, put TEXT in
the primary selection.
On MS-Windows, make TEXT the current selection. If
`x-select-enable-clipboard' is non-nil, copy the text to the
clipboard as well.
On Nextstep, put TEXT in the pasteboard (`x-select-enable-clipboard'
is not used).
x-select-enable-clipboard is a variable defined in `common-win.el'.
Its value is nil
Original value was t
Documentation:
Non-nil means cutting and pasting uses the clipboard.
This is in addition to, but in preference to, the primary selection.
Note that MS-Windows does not support selection types other than the
clipboard. (The primary selection that is set by Emacs is not
accessible to other programs on MS-Windows.)
This variable is not used by the Nextstep port.
You can customize this variable.
This variable was introduced, or its default value was changed, in
version 24.1 of Emacs.
补充一份网上资料：EmacsWiki: Copy And Paste EmacsWiki: Copy And Paste